261543073533203 has 32 divisors (see below), whose sum is σ = 328660383498240. Its totient is φ = 202186983872160.

The previous prime is 261543073533199. The next prime is 261543073533227. The reversal of 261543073533203 is 302335370345162.

It is not a de Polignac number, because 261543073533203 - 2² = 261543073533199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261543073533253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 249849428 + ... + 250894046.

It is an arithmetic number, because the mean of its divisors is an integer number (10270636984320).

Almost surely, 2^{261543073533203} is an apocalyptic number.

261543073533203 is a deficient number, since it is larger than the sum of its proper divisors (67117309965037).

261543073533203 is a wasteful number, since it uses less digits than its factorization.

261543073533203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070367.

The product of its (nonzero) digits is 4082400, while the sum is 47.

The spelling of 261543073533203 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seventy-three million, five hundred thirty-three thousand, two hundred three".